As someone noted on Twitter, that's actually the southbound Fellsway (near Assembly Square). There's no other route from Wellington to Somerville, and that stretch has zero bicycle accommodations whatsoever. Complain all you want about the guy catching a ride off the truck or not wearing a helmet, but remember that the state has done absolutely zero to make this a safe place to ride.

Is decidedly illegal (85.11b § 5) and pretty stupid but the rest of it is true: there is no good way to bike that route. Although I'd probably take Cross Street and the janky crosswalk under 93 to avoid the tunnel of death there.

Depending on where you're going, the least bad choice is probably turning off 28S at Shore Dr and then either going under 28 to Assembly and out into East Somerville, or continuing through Ten Hills and out onto Temple St to Winter Hill. The unavoidable part is the bridge over the Mystic River, but Google seems to think that the sidewalk on the southbound side of 28 is a bike path there...and given there are few pedestrians using it, I'd say that is a much safer route vs riding in traffic on 28. The downside is no trucks to hitch a ride on....

That crosswalk is the place where several pedestrians have gotten killed recently.

There are sidewalks along both sides of that whole stretch of 28. Normally I hate riding on sidewalks (and I consider cycle tracks and bike lanes on the wrong side of floating parking to be sidewalks). But in this case there are so few intersections, driveways, and pedestrians that it should be fine as long as it's not too bumpy.

There are crosswalks at every intersection, though many of them don't have curb ramps. How's that even possible in this day and age?